Safety attachment for stem-winding watches



(No Model.)

B. A. LUCAS & G. P. PHELPS. SAFETY ATTACHMENT FOR STEM WINDING WATCHES.

No. 458,911, Patented Sept. 1,1891.

a Q) Q Q \T a N N g WITNESSES:

IIVVE TOR: 2/ MM/ UNITED STATES PATENT OFFICE.

RAYMOND A. LUCAS AND CASPER F. PHELPS, OF KOIIALA, HAWAII.

SAFETY ATTACHMENT FOR STEM-WINDING WATCHES SPECIFICATION forming part ofLetters Patent No. 458,911, dated September 1, 1891. Application filedJanuary 29, 1891- Serial No. 379,592. (No model.)

To all whom it may concern.-

Be it known that we, RAYMOND A. LUCAS and CASPER F. PHELPS, of Kohala,Hawaii, Hawaiian Islands, have invented a new and Improved SafetyAttachment for Stemindin g Watches, of which the followingis aspecification, reference being had to the annexed drawings, forming apart thereof, in which Figure 1 is a front view of a watch-move mentprovided with our improvement. Fig. 2 is a partial front View with partsbroken away to show the internal construction, and Fig. 3 is atransversesection taken on line a; on in Fig. 1.

Similar letters of reference indicate corresponding parts in all theviews.

The object of our invention is to provide an attachment for stem-windingwatches by means of which the winding-gear will be disengaged when thespring is wound.

Our invention consists in the combination, with the winding mechanism,of a bevel wheel attached to the winding-wheel, a threaded spindleprovided with a bevel pinion engaging the bevel-wheel on thewinding-wheel, an internallythreaded pinion placed on the threadedspindle, a wide-faced pinion journaled in a mortise in the front plateof the movement and en gaging the intern ally-thread ed pinion, abevel-wheel secured to the spring barrel, and an arbor provided at oneend with a pinion engaging the bevel-wheel on the barrel and furnishedat the opposite end with a bevel-Wheel engaging the wide-faced pinion,all as will be hereinafter more fully described.

The watch-movement A is provided with a winding-stem B of the usualdescription, carryin g a bevel-pinion a, which engages the bevel-wheelb, pivoted concentrically with the lever c to the front plate C of themovement.

To the lever c is pivoted the hand-setting pinion d, which iscontinually in engagement with the wheel I) and is capable of engagingthe spur-wheel e on the minute-hand arbor when the watch is adjusted forsetting. To the lever c is also pivoted a spur-wheel f, whichcontinually engages the wheel I), and which may be thrown intoengagement with the spur-wheel g on the barrel-arbor it. The lever c ismoved by drawing out the windin stem B, or in any other well-known way,

To the front plate of the watch-movement is pivoted a spring-pressedclick '2', which engages and retains the spur-wheel g so as to preventit from retrograde movement. A bridge 3', attached to the front plate ofthe movement, supports the upper end of the barrel-arbor.

To the under surface of the bridge j is pivoted a U-shaped lever D, oneend of which touches the lever 0, while the other end reaches round tothe opposite edge of the wheel g. In the bridge j and the bracket 7.5,attached to the front plate of the movement, is journaled a screw Z,upon which is mounted an internally threaded pinion m. The screw Z alsocarries a bevel-pinion 'n, which is engaged by a bevelwheel 0, securedto the face of the wheel g.

In a mortise in the plate C is journaled awide-faced pinion p, whichengages the pin ion on on the screw Z.

I11 supports projecting from the inner face of the front plate of themovement is journaled an arbor 7, provided at its outer end with a bevelcog-wheel 4', which engages the wide-faced pinion p. The opposite end ofthe arbor q carries a bevel-pinion s, which is engaged by a bevel wheelt on the head of the spring'barrel E. A stud it, projecting from theinner face of the lever c, is engaged by a spring c, which presses thestud forward, so as to hold the wheel f normally in engagement with thewheel g. IV hen the spring is wound by turning the stem B in the usualway, the turning of the screw Z, by virtue of its connection with thebarrel-arbor h, results in the moving of the pinion m forward toward thearbor h, the said pinion being prevented from turning by the wide-facedpinion p, and the parts are so proportioned that as the spring is woundsufficiently the boss of the pinon m is brought into contact with thelever D, which lies in its path and the forward movement of the lever Dforces the lever c away from the wheel g, thus disengaging the wheel ffrom the said wheel g, so that the continued turning of the stem Bresults only in the movement of the wheels a, b, and f. As the watchruns down the turning of the barrel E turns the wide faced pinion 19through the medium of the bevel-wheel 1 carried by the barrel, thepinion s, arbor q, and pinion o, and the said wide-faced pinion 1) turnsthe pinion m on the screw Z, causing the pinion to return to theposition of starting.

It is obvious that if the watch is wound when only partly run down thepinion m will advance through a shorter distance to throw the windingmechanism out of gear, so that the length of the screw-threaded arbor tobe traversed by the pinion m is always proportional to the amount ofspring unwound.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent 1 1. The combination, with the winding-wheeland barrel of a stem-Winding watch, of a screw-threaded arbor arrangedto take motion from the winding-wheel, a threaded pinion placed 011 thethreaded arbor, a wide-faced RAYMOND A. LUCAS. CASPER F. PHELPS.Witnesses:

C. J. FALK, .T. WILLIAMs.

